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Вестник Московского государственного технического университета им. Н.Э. Баумана. Серия «Естественные науки»

О генерации лазерного излучения в опале, насыщенном органическим красителем Родамин 6Ж

Е. А. Вощинский, В. С. Горелик

Published Jan 1, 2012• 0 citations
OpenAlex

Abstract

Observations of laser emission in the globular photonic crystal doped with the Rhodamine 6G dye are conducted. The secondary emission spectra are obtained with different experiment schemes for a sample of the Rhodamine 6G dye-doped opal with globules 240 and 260 nm in diameter. It is noted in all investigated cases that the spectral band got narrow and the intensity of the secondary emission increased with respect to exciting emission, which testifies to the transfer from the spontaneous emission to the induced one. The feasibility of laser emission is also confirmed by the performed theoretical estimations.

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Observations of laser emission in the globular photonic crystal doped with the Rhodamine 6G dye are conducted. The secondary emission spectra are obtained with different experiment schemes for a sample of the Rhodamine 6G dye-doped opal with globules 240 and 260 nm in diameter. It is noted in all investigated cases that the spectral band got narrow and the intensity of the secondary emission increased with respect to exciting emission, which testifies to the transfer from the spontaneous emission to the induced one. The feasibility of laser emission is also confirmed by the performed theoretical estimations.
The results of experimental and theoretical studies of the optical properties of globular photonic crystals – new physical objects having a crystal structure with the lattice period exceeding considerably the atomic size, are presented. As globular photonic crystals, artificial opal matrices consisting of close-packed silica globules of diameter ∼200 nm were used. The reflection spectra of these objects characterising the parameters of photonic bands existing in these crystals in the visible spectral region are presented. The idealised models of the energy band structure of photonic crystals investigated in the review give analytic dispersion dependences for the group velocity and the effective photon mass in a globular photonic crystal. The characteristics of secondary emission excited in globular photonic crystals by monochromatic and broadband radiation are presented. The results of investigations of single-photon-excited delayed scattering of light observed in globular photonic crystals exposed to cw UV radiation and radiation from a repetitively pulsed copper vapour laser are presented. The possibilities of using globular photonic crystals as active media for lasing in different spectral regions are considered. It is proposed to use globular photonic crystals as sensitive sensors in optoelectronic devices for molecular analysis of organic and inorganic materials by the modern methods of laser spectroscopy. The results of experimental studies of spontaneous and stimulated globular scattering of light are discussed. The conditions for observing resonance and two-photon-excited delayed scattering of light are found. The possibility of accumulation and localisation of the laser radiation energy inside a globular photonic crystal is reported.
The photonic dispersion, the group-velocity dispersion, the effective mass, refractive index, and the spectral distribution of the density of photonic states near the edge of the photonic stop band are numerically calculated in the one-dimensional model for photonic crystals based on synthetic opals. The fluorescence spectra of rhodamine 6G and 2,5-bis(2-benzoxazolyl)hydroquinone molecules infiltrated into a synthetic opal are measured. For both substances, it is observed that the spontaneous emission intensity in the range of the photonic stop band is appreciably suppressed. A blue shift of the fluorescence spectrum of rhodamine 6G molecules is revealed. Secondary emission of synthetic opals infiltrated with colloidal silver is observed in the Stokes range under excitation of opals by radiation at λ = 400 nm. The spectrum of the secondary emission is located in the range 450–590 nm, which contains the stop band and intervals near its edges.
Recent experimental and theoretical results on the optical properties of globular photonic crystals coauthored by the author are presented. The dispersion relation for electromagnetic waves in a 1D photonic crystal that simulates the properties of a selected direction in the globular photonic crystal is calculated. The spectral ranges that are characterized by the anomalous slowing of electromagnetic waves in the photonic crystal and correspond to the stop-band edges are determined. A method for the measurement of the transmission and reflection spectra of the broadband radiation in photonic crystals is proposed. The method enables one to find the characteristics of the stop bands. The features of the secondary emission that emerges in opals due to the UV and visible excitation are reported. The conditions for the low-threshold lasing in opals filled with rareearth elements are presented. The experimental results on the induced-globular light scattering are demonstrated. Such a scattering implies the coherent excitation of vibrational states of the globules in a globular photonic crystal. A new phenomenon (slow light scattering) which involves the excitation of slow photons (slowtons) that correspond to the stop-band edges of the photonic crystal is observed. The conditions for the measurement of the slow light scattering in opals excited using the ruby and nitrogen lasers are experimentally determined. The experimental and theoretical results open up the prospects for low-threshold nonlinear optical processes in material media.